Dichlorotriazinyl aminofluorescein inhibits human keratocyte proliferation in vitro.

PURPOSE Dichlorotriazinyl aminofluorescein (DTAF) has been used to stain corneal stromal collagen as part of in vivo experimentation. Toxicity of this drug, if present, might alter the observed wound healing. To determine if this drug has any deleterious effect on keratocytes, we evaluated it in vitro. METHODS Human keratocytes in 96 well plates were exposed to different concentrations of DTAF (10e-7, 10e-6, 10e-5, 10e-4, 10e-3, 10e-2, and 10e-1 mg/ml of media). Exposure times of 1 and 24 hours at each concentration of DTAF were evaluated. The cell number was measured 1 and 3 days after exposure to the drug using a coulter-counter and a hemocytometer. RESULTS The proliferation of keratocytes after 24 hours of exposure to the drug was inhibited in a dose dependent manner by DTAF, but 1 hour exposure of keratocytes to the drug did not inhibit keratocyte proliferation. CONCLUSION These results suggest that DTAF has inhibitory effects on human keratocyte proliferation after 24 hours of exposure, while exposure limited to 1 hour does not induce such a change.